This article is for when your user submits a form with a file upload but the file does not appear to upload/attach to the Salesforce record (even though the submission shows it was successful).
Navigate to the Submission Dashboard and locate the Form Submission. Right-click on the submission ID and select Copy Link Address.
From there, in a new tab, paste the copied URL but do not navigate to it, you should have something that looks like
From there you need to cut the middle out so that everything between .com/ and the first character of the ID is gone. The URL in the address bar should now look like:
Locate the Document ID section:
From there, copy the ID indicated in the screenshot and paste that ID over the one in the current URL.
From here, you should be able to click "View File" to see the file that was uploaded.